How do you make the perfect half boil egg?

With so many places serving half boil eggs? What is your way of making sure it is just nice?
Old kopitiam sells it, the new hippy toast joints sells it, this photos are taken from still popular Hong Kong Cafes in Singapore.



Are you able to take a look at the egg above and tell if it is hard boiled or half boiled?



Experts out there, let us know! :-p